Seismic Performance of Piping Systems of Isolated Nuclear Power Plants Determined by Numerical Considerations

Energies

Shinyoung Kwag¹  Seunghyun Eem²  Bubgyu Jeon³  Sungjin Chang³  Daegi Hahm⁴ 

[1] Department of Civil and Environmental Engineering, Hanbat National University, Daejeon 34158, Korea;Department of Convergence & Fusion System Engineering, Major in Plant System Engineering, Kyungpook National University, Sangju 41566, Korea;Korea Construction and Transport Engineering Development Collaboratory Management Institute, Suwon 17058, Korea;Mechanical and Structural Safety Research Division, Korea Atomic Energy Research Institute, Daejeon 37224, Korea;

关键词: pipe analysis;    seismic-response analysis;    finite element method;    cyclic loading tests;    seismic fragility;   

DOI  :  10.3390/en14134028

来源: DOAJ

【 摘 要 】

The interest in the seismic performance of nuclear power plants has increased worldwide since the Fukushima Daiichi Nuclear Power Plant incident. In Korea, interest in the seismic safety of nuclear power plants has increased since the earthquake events in Gyeongju (2016) and Pohang (2017). In Korea, studies have been conducted to apply seismic isolation systems to ensure seismic safety while minimizing the design changes to nuclear power plants. Nuclear power plants with seismic isolation systems may have a higher seismic risk due to the failure of the piping system in the structure after a relatively large displacement. Therefore, it is essential to secure the seismic safety of pipes for the safe operation of nuclear power plants. The seismic safety of pipes is determined by seismic fragility analysis. Seismic fragility analysis requires many seismic response analyses because it is a statistical approach to various random variables. Typical numerical conditions affecting the seismic response analysis of pipes are the convergence conditions and mesh size in numerical analysis. This study examined the change in the seismic safety of piping according to the numerical conditions. The difference in the seismic response analysis results of the piping according to the mesh size was analyzed comparatively. In addition, the change in the seismic fragility curve of the piping according to the convergence conditions was investigated.

【 授权许可】

Unknown